磁性沸石 NaA：以偏高岭土为原料的合成、表征及其对 Cu2+、Pb2+的去除应用。
Magnetic zeolite NaA: synthesis, characterization based on metakaolin and its application for the removal of Cu2+, Pb2+.
机构信息
School of Resource and Environmental Engineering, Hefei University of Technology, China.
出版信息
Chemosphere. 2013 Jun;91(11):1539-46. doi: 10.1016/j.chemosphere.2012.12.038. Epub 2013 Jan 20.
The optimum parameters for synthesis of zeolite NaA based on metakaolin were investigated according to results of cation exchange capacity and static water adsorption of all synthesis products and selected X-ray diffraction (XRD). Magnetic zeolite NaA was synthesized by adding Fe3O4 in the precursor of zeolite. Zeolite NaA and magnetic zeolite NaA were characterized with scanning electron microscopy (SEM) and XRD. Magnetic zeolite NaA with different Fe3O4 loadings was prepared and used for removal of heavy metals (Cu(2+), Pb(2+)). The results show the optimum parameters for synthesis zeolite NaA are SiO2/Al2O3=2.3, Na2O/SiO2=1.4, H2O/Na2O=50, crystallization time 8h, crystallization temperature 95 °C. The addition of Fe3O4 makes the NaA zeolite with good magnetic susceptibility and good magnetic stability regardless of the Fe3O4 loading, confirming the considerable separation efficiency. Additionally, Fe3O4 loading had a little effect on removal of heavy metal by magnetic zeolite, however, the adsorption capacity still reaches 2.3 mmol g(-1) for Cu(2+), Pb(2+) with a removal efficiency of over 95% in spite of 4.7% Fe3O4 loading. This indicates magnetic zeolite can be used to remove metal heavy at least Cu(2+), Pb(2+) from water with metallic contaminants and can be separated easily after a magnetic process.
基于偏高岭土合成沸石 NaA 的最佳参数是根据所有合成产物的阳离子交换容量和静态水吸附的结果，并结合 X 射线衍射（XRD）来选择的。通过在前驱体中添加 Fe3O4 来合成磁性沸石 NaA。用扫描电子显微镜（SEM）和 XRD 对沸石 NaA 和磁性沸石 NaA 进行了表征。制备了不同 Fe3O4 负载量的磁性沸石 NaA，并用于去除重金属（Cu(2+)、Pb(2+)）。结果表明，合成沸石 NaA 的最佳参数为 SiO2/Al2O3=2.3，Na2O/SiO2=1.4，H2O/Na2O=50，晶化时间 8h，晶化温度 95°C。添加 Fe3O4 使 NaA 沸石具有良好的磁化率和良好的磁稳定性，无论 Fe3O4 的负载量如何，都能确认相当高的分离效率。此外，Fe3O4 的负载量对磁性沸石去除重金属的影响不大，但吸附容量仍达到 2.3mmol g(-1)，Cu(2+)、Pb(2+)的去除率均超过 95%，即使 Fe3O4 的负载量为 4.7%。这表明磁性沸石可用于去除水中的金属污染物（至少是 Cu(2+)、Pb(2+)），并且在经过磁处理后很容易分离。
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